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高三英语:语法知识情态动词和虚拟语气

[10-20 00:47:15]   来源:http://www.kmf8.com  高三英语教案   阅读:8766
概要: 其否定式为:cannot have done。 You must have seen the film. You cannot have seen the film. needn’t+ have done:本来不必要做的而实际上又做了。 You needn’t have watered the flowers,for it is going to rain. 注意:didn’t need to(have to)do: 没有必要做而实际上也没有做 I didn’t
高三英语:语法知识情态动词和虚拟语气,标签:高三英语教案模板,http://www.kmf8.com
 

其否定式为:cannot have done。

 

You must have seen the film.

 

You cannot have seen the film.

 

needn’t+ have done:本来不必要做的而实际上又做了。

 

You needn’t have watered the flowers,for it is going to rain.

 

注意:didn’t need to(have to)do:

 

没有必要做而实际上也没有做

 

I didn’t need to clean the windows.My sister did it 2 hours ago.

 

should(ought to)+ have done:本来应该做而实际上又没有做。其否定形式表示某中行为不该发生却发生了。

 

You should have started earlier, but you didn’t.

 

She shouldn’t have taken away my measuring tape,

 

for I worked to use it.

 

注意:He should have finished the work by now.(表推测)

 

虚拟语气

 

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